<?php
$params = [
  'key'         => 'MYCODEHERE',
  'q'           => 'onihana päivä',
  'target'      => 'en',
  'prettyprint' => 1,
  'format'      => 'text'
];

$url = 'https://www.googleapis.com/language/translate/v2?' . http_build_query($params);

$crl = curl_init();
curl_setopt ($crl, CURLOPT_URL,$url);
curl_setopt($crl, CURLOPT_RETURNTRANSFER, true);
$ret = curl_exec($crl);

var_dump(json_decode($ret));
?>

/** RESULTS
object(stdClass)#1 (1) {
  ["error"]=>
  object(stdClass)#2 (3) {
    ["errors"]=>
    array(1) {
      [0]=>
      object(stdClass)#3 (3) {
        ["domain"]=>
        string(11) "usageLimits"
        ["reason"]=>
        string(18) "dailyLimitExceeded"
        ["message"]=>
        string(20) "Daily Limit Exceeded"
      }
    }
    ["code"]=>
    int(403)
    ["message"]=>
    string(20) "Daily Limit Exceeded"
  }
}
*/